1. Department of Molecular Medicine and Haematology; Faculty of Health Sciences; Haemophilia Comprehensive Care Centre; NHLS and University of the Witwatersrand; Johannesburg South Africa
2. City Haemophilia Center; Saint Petersburg Russia
3. Department of Internal Medicine; University of Iowa; Iowa City IA USA
4. Mt Sinai School of Medicine; New York NY USA
5. Division of Hematology/Oncology; Department of Medicine; University of North Carolina at Chapel Hill; Chapel Hill NC USA